70702720897081 has 27 divisors (see below), whose sum is σ = 89060266064493. Its totient is φ = 55940008924800.

The previous prime is 70702720897069. The next prime is 70702720897097. The reversal of 70702720897081 is 18079802720707.

The square root of 70702720897081 is 8408491.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 355651213225 + 70347069683856 = 596365^2 + 8387316^2 .

It is not a de Polignac number, because 70702720897081 - 2²³ = 70702712508473 is a prime.

It is a super-2 number, since 2×70702720897081² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70702720891081) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 765126481 + ... + 765218881.

It is an arithmetic number, because the mean of its divisors is an integer number (3298528372759).

Almost surely, 2^{70702720897081} is an apocalyptic number.

70702720897081 is the 8408491-st square number.

70702720897081 is the 4204246-th centered octagonal number.

It is an amenable number.

70702720897081 is a deficient number, since it is larger than the sum of its proper divisors (18357545167412).

70702720897081 is an frugal number, since it uses more digits than its factorization.

70702720897081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184842 (or 92421 counting only the distinct ones).

The product of its (nonzero) digits is 5531904, while the sum is 58.

The spelling of 70702720897081 in words is "seventy trillion, seven hundred two billion, seven hundred twenty million, eight hundred ninety-seven thousand, eighty-one".